Nigel Keay's brass trio, Triptych for Trumpet, Horn & Trombone was composed in Nelson, New Zealand in 1988 and first performed at the School of Music, Victoria University of Wellington in a "Sonic Boom" concert on 15th April 1991 played by Dan Williams (trumpet), Ross Harris (horn) and Marc Taddei (trombone).

The first movement is in a contrapuntal style using a constantly changing metre.